WTF?? Help!
Check for any loose grounds, failing alternator, or battery.
Check operating temp.
Are the plugs and plug wires in good condition?
Check fuel pressure and test injectors.
Lightly mist the ignition system, observe any arcs or misfires, may help with finding damaged components.
Test the MAP sensor (I'll look into that later, again, likely requires the Tech2?).
Hope this gives you some ideas....Good luck.

